arnold



(No Model.) 4 Sheets-Sheet 1.

W. ARNOLD.

MACHINE FOR MANUFACTURING BOILER TUBES.

No. 352,987. Patented Nov. 23, 1886.'

(No Model.) 4 Sheets-Sheet 2.

W. ARNOLD.

MACHINE FOR MANUFACTURING BOILER TUBES.

No. 352,987. Patented Nov. 23, 1886.

(No Model.) 4 Sheets-Sheet 3.

w. ARNOLD.

MACHINE FOR MANUFACTURING BOILER TUBES.

No. 352,987. Patented Nov. 23, 1886.

Wrzeavem- N. PETERS. Pmw-lnho n mr. WMlIingtom in:

(No Model.) 4 Sheets-Sheet 4.

W. ARNOLD.

MACHINE FOR MANUFACTURING BOILER TUBES. No. 352,987. Patented Nov. 23, 1886.

Wzeases: W

N. PErERs Pmla'kilhfignphur. Washinginn. u C.

UNITED STATES PATENT OFFIoE.

WILLIAM ARNOLD, OF BARNSLEY,.OOUNT Y OF YORK, ENGLAND.

MACHINE FOR MANUFACTURING BOILER-TUBES.

SPECIFICATION forming part of Letters Patent No. 352,987, dated November 23, 1886. Application filed May 12, 1886. Serial No. 201,905. (No model.)' Patented in England February 9, 1882, No. 635.

.To all whom it may concern.-

1 Be it known that I, WILLIAM ARNOLD, of Barnsley, in the county of York, England, engineer, have invented certain Improved Machinery for the Manufacture of Boiler-Flue Tubes, of which thefollowing is aspecification.

This invention relates to a novel arrange-- ment of machinery for shaping up cylindrical tubes into a barrel or double-cone section with flanged ends, for the purpose of constructing therewith steam-boiler flues, which, besides presenting a large heat-absorbing surface to the flame and heated gases of the furnace-fires, will possess an increased power of resisting the external pressure of the water in the boiler as compared with cylindrical tubes of like weight. y

In preparing tubes of this characterit is essential that the operation of shaping and flanging them should be carried out with great expedition, because the metal under treatment must be worked whileat a high heat-to prevent the fiber of the metal being distressed or weakened during the manufacture. To effect this compound operation of shaping and flanging at one heating of the metal, I employ the arrangement of machinery illustrated in the drawings, where Figure 1 is a front view of my improved machine. Fig. 2 is a plan view, and Fig. 3' is a side elevation, of the same. Fig. 4 is a. sectional view of a removable bearing for the axle of the main shaping-roll, the same being shown in section with its supporting-bracket; and Fig; 5 is a longitudinal sectionof a boiler-flue made up of tubes manufactured by my improved machine.

This machine consists, mainly, of a set of shapingrolls, between which the tube is subjected to a rolling-pressure.

A A is the main framing, set iipon a hollow foundation, B B, the front part of which is open to provide space for. the pendent work under treatment. Hinged to the front part of the framing A-is a bracket, 0, fitted with a bearing, 0, for supporting the front end of a driven horizontal axle, D, which extends rear; ward of the framing A, and has its rearrnost bearing in a casting, A. ,Keyed tothis axle is a roll, E, having a profile corresponding to the line of section which the tube is designed to receive, and above this roll are three rolls,

F F, the counterpart of the lower roll mounted in a pair of vertically-sliding frames fitted t o the inner sides of the end frames, AA. Thesesliding frames G G depend from adjusting-screws g g, which work in tapped holes in the frames G, and are free to turn in sockets made for them in the main framing. Each screw 9 is fitted witha b evel-pinion, g, which pinions rest upon the top of the framing A and serve to carry the whole-weight of the three top rolls and their axles. The screws are also fitted with collars 95 g", which will prevent the screws from being forced upward by the-back-pressure of the top rolls.

H H is a pair of small rollers set to work in a vertical plane, for the purpose of bearing upon the ends of the tube and bending them up into flanges.

The hinged bracket 0, which carries the hearing for the front end of the axle D, is employed to allow ofthe tube being slid endwise onto the shaping-roll while the upper pressing-rolls are in their raised position.

By reference to Fig. 4 it will be seen that the bearing 0 is wedge-shaped in longitudinal section, and is pivoted to a hand lever, c, which has its fulcrum on the'hinged bracket 0. This bracket is held fast in its closed position by a pin, 0, which passes through the free end.

of the bracket and enters a'pin-bole in the foot of the framing A.

The flanging-rollerH is mounted in bearings carried by an adjustable arm, 72, which is pivoted .to a short standard carried by the hinged bracket 0. Fitted to this hinged bracket is a screwed pin, h, which passes through the. free end of the pivoted arm hand carries a whee1-nut, h ,.by turning which the roller H is forced into contact with the end of the tube to complete the formation of a flange thereon.

To provide for the ready admission of the heated tube to the rolls, it is only necessary to withdraw the pin 0 and to pull back thehandlever 0, which withdraws the bearing 0 from under the axle D, and at the same time throws back the bracket 0, together with the flanging-roller H, which it carries, to the dotted position of Fig. 2.

At the back of the machine the flangingroller H is carried by an adjustable arm, h

Projecting from this framing and through the free end of the arm hiis a screwed pin, lb, carrying a wheel-nut, h, for pressing the flang- "receive also an axial motion.

ing-roller H into contact with the tube and completing the formation of a flange thereon.

I have stated that the tube to be shaped and flanged is introduced into the machine when the pressing-rolls are in their raised position. In order to bring them down rapidly to their work, the bevel-pinions g, which support the sliding frames G, are caused to rotate simultaneously by means of bevel-wheels keyed to a longitudinal shaft, I, which has its bearings at the top' of the framing A. This shaft is provided with fast and loose band-pulleys i z" '5 which receive driving-bands from overhead shaftiug. One of these bands is open and the other crossed for the purpose of imparting rotary motion in reverse directions to the shaft I. A belt-shifter is provided for throwing one or other, or both, of these bands out of action. By this arrangement a rapid rotation is im parted to the screws 9, from which the frames G and their rolls depend, and thus the pressing-rolls F F F are brought rapidly into action. To impartincreased energy to the rolls, I apply a hand-wheel, I, to the shaft 1, by turning which the middle roll, F, will be forced into closer contact with its work than could be effected through the driving-band. This roll F, I prefer to make in tubular sections say five in numberto compensate for the unequal friction due to the varying diameters of the rolling-surface.

The outer rolls, F and F serve to steady the work and keep it in position while the rolls E and F are molding it to the required shape. The roll IE, it will be seen, has a barreIshaped contour, which corresponds to the form of section desired to be imparted to the tube. This roll is also shaped at its ends so as to turn up the edges of the tube and prepare them for conversion into flanges.

-The compound roll F corresponds in profile with the roll E, it being a counterpart thereof. The action of the two rolls is to contract the diameter of the tube near its ends, and to force the greater part of the displaced metal toward the enlarged center.

The axle D, which carries the shaping-roll E, receives motion from any prime mover, and when the pressingrolls are brought down into action they will, by contact with the heated tube, which is 'rotated by the shaping-roll E,

Thus every portion of the tube will be brought in succession intothe bite of the rolls E F, the bite being increased as desired by the turning of the handwheel 1. While the tube is thus being molded to shape the attendant will, by means of the wheel-nuts h and 7L5, gradually force inward the flanging-rolls H H which, bearing on the inclined ends of the tube, will bend them up at right angles without putting any undue strain on the metal.

From the foregoing it will be understood that I am enabled greatly to expedite the shaping operation, and so efiectually to impart an endwise and downward pressure upon the yielding metal as to insure the crowding up of metal toward the middle of the tube, and the maintenance of the normal thickness at that part, notwithstanding the increased di stiffening-ring between the flanges, such rings being a hinderance to free contract-ion and expansion.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim isl. The combination, in a machine for manufacturing flanged boiler-flue tubes having va- 3. In combinationwith the drivingaxle carrying the shaping-roll, the hinged bracket at the front of the machine, with its adjustable bearing pivoted to a hand-lever forsupport ing the front end of the axle, and providing for the insertion into the machine of the heated tube to be molded and flanged.

4. In combination with the hinged bracket carrying the bearing of the shaping-roll axle, the flangingroller H, mounted in an adj ustable arm, h, pivoted to the bracket and serving to press-the roller to its work.

NVILLIAM ARNOLD.

Witnesses:

BENJ. BURDEKIN,

Notary Public, Sheflield, England. (Jr-mamas RENSHA\V,

His Clerk. 

